Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5204f8b2dd67f46…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 08:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aae02c38dd695bb8086d2c6760b32262 SHA-1: 56be368dba7fe0ffd4c2cb3eaddb3108455e7e88 SHA-256: c5204f8b2dd67f46c86a199e2d33fa45f7976bb1aaeab240153284b01a60b68a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of many distinct hosts and disposable hosting patterns indicates a deliberate effort to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cedule-plachty.cz/files/file/27922160238.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b116563e7b---11971939426.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/wupipezawimozimafu.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///nekejawifaxes.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/591931627787b919cc12c01e7fe93f05/forugile.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1eac5c18996bb6816fc652771b2b674a/lowologamojivikamagopizus.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/90766397295.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/v3sbqhve02kvi5ki3587dutfg9/18312781324.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cfde92f7---waluvunebirer.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/6473209327.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb56f9d3b3---fogafijafotivujejawo.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/vujazuraxixep.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/ratetefitido.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e123f144990---44921826211.pdfIn PDF document text
    • http://agrion.org/upload/fichier/58669836474.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kfo81hd7n9dj9tc4oj55jh5ed3/34737427373.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kevorufijuviguxa.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55360236547.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/36728635514.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vijusininoduzojijawew.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/46670715422.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3aa8cbb6ad140ae243a033c0cc04f94e/51900920823.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dcc09fb07eaa035e435d338ed98beb98/9515186926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=responsibility+of+nurse+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10728 bytes
SHA-256: 1a2ff5d4e41417e188df56ef19a9ba0028c7032a59415fb71d735f8ded7bdb10
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 18312 bytes
SHA-256: ba4a9a4714ba4953ee5a214b1d033e97294a62f6c83cf1dad6f232ec9fb455c2

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